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Cumulative water intake by young (open circles) and aged (black squares) female Brown Norway rats after treatment with isoproterenol. Measurements were taken at 30-min intervals for 90 min after s.c. isoproterenol injection; intakes were normalized to body weight. 1 = significantly greater than aged females at corresponding time point (ps<0.01-0.001); 2 = significantly greater than preceding time point within age group (ps<0.01-0.001)
